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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96ace770243dadce0e72539efce258e275b6d7b526aaa3b8619d3e318b0fe4e3' 
  AND token = '9liVi+TKHtlPaj0erMifR7os/NU63YoabQLPY/3BbxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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