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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '00a26b7d8e6edc5f899c498c38513fd1c66c5a0477eecba18c38d02eb2c1299f' 
  AND token = 'gtxHTQ4AfGgTnnCuit2moXhT4ZvPkmPfbbjFs21NFkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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