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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9807a5b0af996c76c4604860deaf54eb309e3c9d4d936c977635ea791eefd8bf' 
  AND token = 'hZBNuS9L1m1YIaWr1J53Ocrv8k71EicyZYWNlhWP/KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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