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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cd5e645d4dc522b3434387677e62793ed724b1fa02cdcfef5a7cba6b722cb009' 
  AND token = 'sorhmzamaeTZLlI8OlKztZ0gytHS+gDxyqrQ17bxO3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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