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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a056d4201a60ef3e6eafb132397ca02c0802c0b2dd87bf5c15f65f3fa7fdeaaf' 
  AND token = 'xQg/7QeSd3SO16VJYvHtSMNK5jljwJJrVDP7ooHxfqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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