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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '26193e2a5174910bb54530e13477ea15a18a12cb46ecc5fdd425485580c890f9' 
  AND token = 'rN6attlglE5SDv6/UsT4wGT/fsXJlma8o76Rr5vP1p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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