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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '50e18a13a70fd33d3b9b69b9f5f5e19a511ce8328b2a1ad0dc13f96c30f25a15' 
  AND token = 'JQSyXNpFZnVfBUQ1TWkr4qoJZ3vtXUx761uqO2W9co0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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