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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'db98449c9b49cb22c54ca0cfdaad604747128b083df0c794c03ac0a6d7bbbfcc' 
  AND token = 'yDGvUo90WGEe+/S1tKgaXG2vgAhmbD4yA7olScFmll8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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