SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a9bf1045942c2e57b78f8c44611aad2697f2e15457c1ffa67fb1c995c00089e1' 
  AND token = 'kFZFRG8gHlgnA2w+jupgOlIHCULfqJ5Nkoz2wnaGvsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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