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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3f10312cb83ca6569a92dcabeefbe82682c9096df402fa0654dc7c094e234c10' 
  AND token = 'UnI1H3odSJAwgnOnHkVzwYjmibJdo7ro5JwHlkW5dA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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