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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e747b4690d15df29c713191c4164b41b2dad16f66663d86ac8ef5e08966c2cdf' 
  AND token = 'qL5r9F87awUBj56bksFcC4NYmtQbpJhoP9P7g8yYy/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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