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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b004bf574893c2de44d4ad1ab33a29fb6ceb5b71ba2c2106d6594a1d0861018b' 
  AND token = 'O5BYKsdvatbwLi5ipo0A/USl3XNoxf16s1k7meFn+W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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