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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9525552aa323e16f42b01e9bb6ffcf2f261f9e6e83c8efb4ef388d267c9a2de2' 
  AND token = 'yTuedWObRby0gwabokD5dIfkxU9BhGGLTXRtQa5hT3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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