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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd6bcfb7ed9f26b00cebeff868ba479a1f5b6269a1f1b1a551a19a24a610da45d' 
  AND token = 'i6EY8dYkyt8pYxQDWOrWl8eVZqlIvHxjyLFrAxEzAZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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