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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e016dcef5731d4db5d73ec8634caf82a9daaa32a59f1da7b35d747cc5786659e' 
  AND token = 'zrn1S4+RYfM4vvzpZZ7UUrsqYR61ka5D2xkn1V4emXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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