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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c74598e5bafdb32028f4e1da6814606c150feea0e0bfcb125d22c2ea86a86ee0' 
  AND token = '5USuClciLxrQ16yiQ5izY9fOAMp6dLDQRcrhzKjM0uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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