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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9ab975ab81cac2ec252a2a3e5a5140287d83f6143ab5a20b1157dcf1f8c6333' 
  AND token = '+Ey3Sia0H5yZIro/VDul9AOZcthKzHM74HhZWsOSSPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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