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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '893a41bcccd4cfc1cac0955beb64340f7a64a7e0532a9d28175cbb0f4c9943a5' 
  AND token = 'vWKLWBDLL5lOyV0gNQravZ/a/MYU1i+N0BkvkJCo7Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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