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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4eb30dc7800c19307a678c34d5c604ead31b438d7766b47f9b63b96167e2db35' 
  AND token = 'NX50ncQGjiAyW8Npd37BS5eFRruhQ47UPA7BduFCVkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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