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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '73ab2bc3d7de2cd779f58fce7c5ed527f7f873a745a4f452bfd5f7b7b0bb69cd' 
  AND token = 'xX0hC49AH/tKCy9AnEkBjwXKPXAIC0cm/lffNqYeAtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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