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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '689d29300e355edb864b51a470de2983c9890e48feee571bd809f5bd7daddaf5' 
  AND token = 'kO/mpHvpeXxBTm3wa6wD2yR7EAJ98KdpIxr9dFvXMzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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