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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '711e440131935366b77cd1f86bb123593923dc72b8c7173b7769829c121a1b98' 
  AND token = 'NFiiwEbtOXMEQ9XqJl9h4KYL0MISuFbS4peW0Il64ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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