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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65dc370f6925e5e8957a2eba83e7da226c5a7933a5f3d0defa46cc4dc0464067' 
  AND token = 'rSVGyual2hV4PkXSr6fFE+5bZh9oDrQ65EYr+lVu3Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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