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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b48db3f029969406b500fbb5a854dccced28719db1315bd818614df2ab90e6f' 
  AND token = 'd/efJbH5d2bd9Ye3lPbMw951Kz3Sy5067WThcdRXG1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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