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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d0c266d665b935305c43a09a6fd88ed5d535b7132930686b5a2b3739d982ba9' 
  AND token = 'SbocINP4r3rv8ypF0GkoJAyMtsEvlJ1aLo+6wlC0ti0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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