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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e1e8f83c9d6c49778ab7fb1a522f29915e109a533aadbddd17394b628268a6b1' 
  AND token = '+7AWOHj9GQ2d0fIKCY+r44narqNtqclZbL7xCdTHgyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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