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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4323fd68eb13dbb2f5b4812010aeb42fa994faaceb1be209425fbb46c7471cb2' 
  AND token = 'Tu5V3wcxT7mT4UrVmedLNpDWGDn5HeCA9E4U8/8TO4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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