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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9dc2a74a51a7f41d3a71eefe98f254f48d0f9936beca990a17b495ef851c81d' 
  AND token = 'zbD/aURRtFcqIrmVOfiH/yZyL0WHeNzB0AXqb1l/Bm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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