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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f5946e5ad132ea7e9cc27a624cfdf6bc56dfa3250d8d89c67f569b4270c2e6a7' 
  AND token = 'QFN65lrJFlm357iefZO1LynDMQ7sbsokCwm4heJoYks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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