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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bbf2a851254ea6f38f717e9b663de7d32e4642763e35d2b87337f4fa2d4c1841' 
  AND token = 'CeFpeHIcFgUvIdYK6qniTfhDPjbKCFi8G44LP6QaJXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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