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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '38849e3e1af490040c50f5878fab3a18d642f88636c62a52dbf555275f505374' 
  AND token = 'nEJAcBosVx1tWWer4LWPtrAcld6L+CJgA+77mBtge2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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