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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b5a594e01444ecec0c8d65d5cd89e70fddc7dc60c4a34cf09b71e05e5eb4ed01' 
  AND token = 'i7hZScpFxTtCv9An9jVVOYWYSbkm+Wj+lz4Btmq5Ba0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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