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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '63e81033f2c4f3631cff8a5ae3f8877046d3aa401934549f600320c5413aefa3' 
  AND token = 'pMiPUgjNr7C16jJUYdGk00qoV7HN1vpkX8PFy0PXbQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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