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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '285ffbd7b864a06d49fe60f033cbc81606a97af76c0fd2812930b606d13bd7ae' 
  AND token = 'KR7Ffc/xv46CVG7HqgEIFiovkSgFP+OH1ik726Mnmvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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