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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ba3830ebdf160f03e0588d0dc7de06d12f85a1b4efa68ee1129282d51886d407' 
  AND token = 'w4DusPsnktDoTjO1ouUkqX7jIOz2DP9HN9Ta0QFWBiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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