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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98bea253a4d00d3b5717934dd182ef7de6db3c3e0e943e20dbe359440e98ffa2' 
  AND token = 'VXk0lHCiJnfh4Ufv4hPLlLHJJ/yz5eDi6b0tk0ir7S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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