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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f929994af91c6f07d32df53d88597c926fff6ead11b4d5ce9f484ff7513b7eb' 
  AND token = 'h3DKn7pmkw9T8g5RowrqQBE5713HZ/EVloME8kz8lro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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