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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d8b2cce11dd1d822bc96547875a39f96eb1c45ece1a08499e0af3c925387126' 
  AND token = 's5yNCcfrsesTY2cCIxFg5kWa0JL1ILSZ3m7CM8+grsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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