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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2389335d733e58bb4f8b3e1541c2b5f5d287df1c3b47323c227f4b89bb51615e' 
  AND token = 'aYbMrZNRo8NEYIJS9bEP+O6MssK/ph1xzprTTM45hgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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