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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5bc880f4b7de708cdc7aacd5d6d0bbdc9f352a7839826258ea9a183d2ea9db77' 
  AND token = 'A6w9kew9L8Np3q8TBh8Nnc88vm1RYsi/WbxujDliY58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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