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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56a0652c323245a1209ac2597b4ad5254ad7048ee295a12256564e88e918d1da' 
  AND token = 'J5Il5XlPL/zvYdbobS8gJCMNEP+nFkOcOZetFDFu1bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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