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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '41da264f74eb026c405b6834509f67c7d399f33c6d19c40df6981317a1c556d5' 
  AND token = '7jyrJXXgI5HTI6FEtmD7S/z6mndJRnnxD+TPrDGpvMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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