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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f2d79992c83106fa1e41c8d690b608d232c6803d95e374a27784a4eaf176735' 
  AND token = 'RwXNSWWeYO1p5SIVGqx5eTouiR7BOBPg1woWwtarkEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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