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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'db7683ad0f989057a5e273ff22df0564ed558f31516cf505bf2b59d3f048528a' 
  AND token = '7zy2h436P5bD+19kT6ZmeUUnyUvnIhl6LahnTE1XUm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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