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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '88e8b17643f9767f3e3d5c0f5f0e2677ce8eddfc05c190b149daafa2a7e343ea' 
  AND token = 'exZ9HCuFyxe8SOykisxP6JBVRYPayAI2GkNY7+Rma0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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