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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '899f1e723a59513259590160b16a70a93c63e37d48d9dfd407ebb70ac418c9e2' 
  AND token = 'm2xVdjpkezUei7K65pxcctlEbSc8J0APLXbCZjVLO5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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