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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '072228c9380663cc3a3e4883037e851317987b453d27ac77550b72f7bb41703c' 
  AND token = 'fGK9e0lHE8RDoIn5oY0Pk8e1gsnwT8awcjNaDc8n7Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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