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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7b58c0a58fca1c4691c4cc4c40df6d48fed15cfbb6d2b91a90a649e7670bd9ba' 
  AND token = 'tZ0hm2nHrkOia7zvQ6m16wGtn0E2aKjBvDN3n8qVNcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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