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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb3c3d1fb9a22645637c29fbc0a7bea556da92dd872232fa6ff3f9a433a706c0' 
  AND token = '97+NUcAlck53fxlN/Ht7Zp+qMHv8PH86QdwC8RzZBvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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