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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0f1bc6e0fa590a3ce732429778c0c1d33520ba6b58fcaaa7c9bd4d66632133e5' 
  AND token = 'H97Oqad0hRcPvgomkiJVnmoBL5lISdcfdWQOUsdX9DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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