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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '361be167e2e8bd33e33b6990a3f1ca76126e8f1d804cb45db93d79f90c657d0e' 
  AND token = 'D3BuG3QPLE11fyipEWW7u6/ervxeWQiqT8ViXoQ5C9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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