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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'acba371c450e208aa25c9baea2aa64ea4048f6c39d5e8488361815dc1d4d71a1' 
  AND token = 'ZYovvbrmNp1oQXtLEH64YYSBLp5Vw0DOtZWI9VMO9zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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