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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58f3c04fc42475d14f98641ba2de037d4a8dc45a386c5ff19fc93495c9153b4c' 
  AND token = 'xp2sxIIign7IgGr6dcZ2flwhNy/ExffoAWHutlrBxRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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