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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf68983bab33020a9bfb9a8cde3ba68a14d29831c9d594c67bc92ea94475aa63' 
  AND token = 'Xy98bqNYAhOf0Tvpvu8rlFPiC9rkPOJ6663cq03FJR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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