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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c3e2e54dd85741f70fba453ff38e890f5f387c1b1d7e025aebcd4e75473cfb34' 
  AND token = 'q7x1KjRbOxvHvk/GS5cActIT2TvxR0aF2CWqY9Zloi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}