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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e2745e0964eaa18d7927dc5ac10d86fc8f1ca5ad21dec006950a6337daf67020' 
  AND token = 'vDop1q2Ta2/NyPs+Zk3ctXAel499c6bepmd6O0AzQmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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