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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '46c88969898acdab96931bd1b557c7c7f5e808e555f82f91f75cdff7b2792b10' 
  AND token = '72RBrCZW3h1TDO7vpS2PP9PSj3K1D7oJky1otPt9MGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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