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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd960cedfd4dfeec07fe54db4089d36fa8655509109d0804e74a84320712d50a8' 
  AND token = 'BkXjWg19vNVSVyTxzUQGh0Wh7yD8b23J9HZdHN03G74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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