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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ab5d947f4bc62b0fb484f6d1ca6c7dc95b3c5f8544921e363f231a042711d99' 
  AND token = 'gXhbuEqOufTlcKreHGy9NbAKKrkFxGEq0l9bqbX7zHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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