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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a9e6dc1c160b131da5d418e1d5c93aeec4684ff87b04ab7a824ad93ba32971a' 
  AND token = 'T6KKZA8LUGRfghsnJnc4v+/a1D4LzHN6C5rNbL30pB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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